000
AXPZ20 KNHC 170917
TWDEP 

TROPICAL WEATHER DISCUSSION     
NWS TPC/NATIONAL HURRICANE CENTER MIAMI FL
1005 UTC SUN DEC 17 2006

TROPICAL WEATHER DISCUSSION FOR THE EASTERN PACIFIC OCEAN FROM 
THE EQUATOR TO 32N...EAST OF 140W. THE FOLLOWING INFORMATION IS 
BASED ON SATELLITE IMAGERY...WEATHER OBSERVATIONS...RADAR...AND 
METEOROLOGICAL ANALYSIS.

BASED ON 0600 UTC SURFACE ANALYSIS AND SATELLITE IMAGERY THROUGH 
0900 UTC.

...ITCZ...
THE ITCZ AXIS IS CENTERED ALONG 5N77W 8N100W 7N120W 7N140W. 
SCATTERED MODERATE ISOLATED STRONG CONVECTION WITH 60 NM EITHER 
SIDE OF AXIS FROM 121W TO 128W. SCATTERED MODERATE TO STRONG 
WITHIN 120 NM S OF AXIS FROM 131W TO 140W.

...DISCUSSION...
AN UPPER LEVEL TROUGH IS OVER THE NW PORTION OF THE REGION FROM 
32N127W TO 25N125W. A 90-100 KT JETSTREAM S OF THE TROUGH AXIS 
FROM 23N140W TO 28N126W THEN INCREASING TO 130 KT TO BEYOND 
32N118W. A 120 NM BAND OF MODERATE TO STRONG SUBSIDENCE IS 
WITHIN 120 NM N OF THE JET AXIS. A MID/UPPER RIDGE COVERS THE 
AREA E OF THE TROUGH...WITH AN EMBEDDED UPPER TROUGH FROM 
20N106W TO 5N110W. EXCEPT FOR A 180 NM BAND OF UPPER LEVEL 
MOISTURE S OF THE JET...MODERATE TO STRONG SUBSIDENCE COVERS THE 
AREA W OF 110W. UPPER LEVEL ANTICYCLONE OVER THE CENTRAL 
CARIBBEAN WITH A RIDGE EXTENDING W ACROSS CENTRAL AMERICA. 

SURFACE RIDGE HAS AXIS FROM 32N139W TO 20N 114W....WITH A 
DISSIPATING  COLD FROM FROM N COAST OF THE BAJA PENINSULA NEAR 
32N116W TO 26N121W. BROKEN TO OVERCAST STRATOCUMULUS CLOUDS 
COVER THE AREA N OF 15N W OF 115W. ANOTHER TROUGH IS ANALYZED 
ALONG THE ITCZ FROM 12N100W TO 3N103W. SCATTERED TSTMS ARE ALONG 
THE TROUGH FROM 7N-10N.

$$
DGS